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The Thinning of Sitka spruce - Two Experiments 19 basal area removal (43 % -30 %) volume and second thinnings at 80 % - 60% basal area increment removal (50 %-40 % volume) these studies are being developed to include a more refined intensity experiment for Sitka spruce with a greater number of treatments ar,d replicates, and an experiment into various means of systematic thinning with a standard first reduction of one third o.n stocking. Other species, notably contorta pine, Norway spruce and Scets pine are also at present under investigation. ACKNOWLEDGEMENTS Acknowledgement is due to Dr. P. M. Joyce, who was iavolved in the planning of one of the experiments, and to Mr. WI. Luddy, Research Forester, who undertook most of the field work for these investigations. SUMMARY The paper reviews the initial effects on Sitka spruce crop growt'1 of three intensities and two types of thinning. Main crop bas3.1 areas and probably volumes are depressed by very heavy intensities in the early years after first thinning but re:overy is recorded in the fourth year. Main crop diameter increment is significantly great::r with heavy thinnings which also yield higher thinning volumes. Litcle difference is recorded between law and eclectic thinning tho:lgh there is a suggestion that main crop growth is g;reater with the former. First thinning produce from the eclectic method is greater in tree size and volume yield though indications are that this difference will disappear in time. REFERENCES Braathe, P. 1957. Thinnings in even aged stands. A summary of Europe'Ctn Literature. Faculty of Forestry, University 0'£ New Brunswick. Bradley, R. T., 1967. (a) Thinninf{ Control in British Woodlands. Booklet 17. For. Comm. Lond. , 1967. (b) Thinning experiments and the application of research findings in Great Britain. Proc. 14th Congr . .Tnt. Union For. Res. Organ. Munich Pt. VI. Sect. 25. (242-249). , Christie, J. M. and Johnston" D . R. 1966. Forest Management Tables. Booklet 16 For. Comm. Lend. Franz, F., 1967. Uber methodische Frlgen bei der Anlage von Bestandespflege - Versuchen nach den Vorschlagen von P. Abetz. Pmc. 14th COnj;1. Int. Union For. Res. Organ. Munich, Pt. IV, Sect. 23. (35 -39).
Irish Forestry Gallagher, G., 1966. Thinning, in Forest ReseafCh Review 1957-64. Dept. Lands, Forestry Division, Dublin. (69-75). Holmsgaard, E., 1958. Comments on some German and Swedish thinning experiments in Norway spruce. For. Sci. 14 (54- 60). Hummel, F. c., 1947. The Bowmont Norway spruce sample plots. Forestry 21 (30-42). ----- Locke, A. M. L., Jeffers, J. R., and Christie, J. M., 1959. Code of Sample plot procedure. Bull For Comm. Land. 31. J.U.F.R.O. (Unpublished) Methods for thinning experiments. Report of the Study Group "Thinnings", presented to 14th Congr. Int. Union For. Res. Organ, Munich, 1967. MacDonald, J. A. B., 1961. The simple rules of the Scottish Eclectic thinl':!ing method. Sconish Forestry, 15 (220-226). MacKenzie, A. M. , 1962. The Bowmont Norway spruce ~ample plots 1930-60. Effects of thinl':!ing treatment on growth. Forestry 35 (129-138). Moller, C. M., 1954. The influence of thinning on volume increment in Thinning Problems and practices in Denmark. N.Y. St. For. Tech. Publ. 76. Schober, R., 1967. Ideas and proposals for a new system of thinning and tree classification. Proc. 14th Congr. Int. Union For. Res. Organ. Munich, Pt. VI. Sect. 25 (61-95). Vuokila, Y., 1962. The effect of thinnings Ol':! the yield of pine and birch stands. Commttn. Inst. For. Fenn. 55 (12).
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